The provisions of this section apply to ship repairing, shipbuilding and shipbreaking.
Table E-1-Dimensions and Spacing of Wood Independent-Pole Scaffold Members
Structural members | Light duty (Up to 25 pounds per square foot)-Height in feet | Heavy duty (25 to 75 pounds per square foot)-Height in feet | ||||
[LESS THAN EQUAL TO]24 | [GREATER THAN]24[LESS THAN EQUAL TO]40 | [GREATER THAN]40[LESS THAN EQUAL TO]60 | [LESS THAN EQUAL TO]24 | [GREATER THAN]24[LESS THAN EQUAL TO]40 | [GREATER THAN]40[LESS THAN EQUAL TO]60 | |
Poles or uprights (in inches) | 2 * 4 | 3 * 4 or 2 * 6 | 4 * 4 | 3 * 4 | 4 * 4 | 4 * 6 |
Bearers (in inches) | 2 * 6 | 2 * 6 | 2 * 6 | 2 * 8 | 2 * 8 | 2 * 10 |
Ledgers (in inches) | 2 * 6 | 2 * 6 | 2 * 6 | 2 * 8 | 2 * 8 | 2 * 8 |
Stringers (not supporting bearers) (in inches) | 1 * 6 | 1 * 6 | 1 * 6 | 1 * 6 | 1 * 6 | 1 * 6 |
Braces (in inches) | 1 * 4 | 1 * 6 | 1 * 6 | 1 * 6 | 1 * 6 | 1 * 6 |
Pole spacing-longitudinally (in feet) | 71/2 | 71/2 | 71/2 | 7 | 7 | 7 |
Pole spacing-transversely (in feet) | 61/2 min | 71/2 min | 81/2 min | 61/2 | 10 | 10 |
Ledger spacing-vertically (in feet) | 7 | 7 | 7 | 41/2 | 41/2 | 41/2 |
Table E-2-Specifications for Side Rails of Ladders
Length (in feet) | Cross section (in inches) | |
At ends | At center | |
15 | 17/8 * 23/4 | 17/8 * 33/4 |
16 | 17/8 * 23/4 | 17/8 * 33/4 |
18 | 17/8 * 3 | 17/8 * 4 |
20 | 17/8 * 3 | 17/8 * 4 |
24 | 17/8 * 3 | 17/8 * 41/2 |
Table E-3-Specifications for the Construction of Horses
Structural members | Height in feet | ||
[LESS THAN EQUAL TO]10 | [GREATER THAN]10[LESS THAN EQUAL TO]16 | 16[LESS THAN EQUAL TO]20 | |
inches | inches | inches | |
Legs | 2 * 4 | 3 * 4 | 4 * 6 |
Bearers or headers | 2 * 6 | 2 * 8 | 4 * 6 |
Crossbraces | 2 * 4 | 2 * 4 | 2 * 6 |
or | |||
1 * 8 | |||
Longitudinal braces | 2 * 4 | 2 * 6 | 2 * 6 |
Table E-4-Safe Center Loads for Scaffold Plank of 1,100 Pounds Fibre Stress
Span in feet | Lumber dimensions in inches | |||||||||
A | B | A | B | A | B | A | B | A | B | |
2 * 10 | 15/8 * 91/2 | 2 * 12 | 15/8 * 111/2 | 3 * 8 | 25/8 * 71/2 | 3 * 10 | 25/8 * 91/2 | 3 * 12 | 25/8 * 111/2 | |
6 | 256 | 309 | 526 | 667 | 807 | |||||
8 | 192 | 232 | 395 | 500 | 605 | |||||
10 | 153 | 186 | 316 | 400 | 484 | |||||
12 | 128 | 155 | 263 | 333 | 404 | |||||
14 | 110 | 133 | 225 | 286 | 346 | |||||
16 | 116 | 197 | 250 | 303 |
(A)-Rough lumber.
(B)-Dressed lumber.
Table G-1-Number and Spacing of U-Bolt Wire Rope Clips
Improved plow steel, rope diameter, inches | Number of clips | Minimum spacing, inches | |
Drop forged | Other material | ||
(1) | |||
1/2 | 3 | 4 | 3 |
5/8 | 3 | 4 | 33/4 |
3/4 | 4 | 5 | 41/2 |
7/8 | 4 | 5 | 51/4 |
1 | 4 | 6 | 6 |
11/8 | 5 | 6 | 63/4 |
11/4 | 5 | 7 | 71/2 |
13/8 | 6 | 7 | 81/4 |
11/2 | 6 | 8 | 9 |
1 Three clips shall be used on wire size less than 1/2-inch diameter.
Table G-2-Maximum Allowable Wear at Any Point of Link
Chain size in inches | Maximum allowable wear in fraction of inches |
1/4(9/32) | 3/64 |
3/8 | 5/64 |
1/2 | 7/64 |
5/8 | 9/64 |
3/4 | 5/32 |
7/8 | 11/64 |
1 | 3/16 |
11/8 | 7/32 |
11/4 | 1/4 |
13/8 | 9/32 |
11/2 | 5/16 |
13/4 | 11/32 |
29 C.F.R. §1915.118